This allows cool, fresh air to come in and old, stale air to flow out. Opening the windows in your home or office has the benefit of replacing the moist inside air with dry, fresh air from outside. Austrian windows open vertically and horizontally, so by keeping the top of the window open, cold air is allowed to circulate into the room at night. Their parents swear the fresh air helps them sleep better, and they're probably right. Sleeping in a room that's been filled with cold, fresh air is a similar concept.

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